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M. Bowden



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    MINI 30 - New Kinase Targets (ID 157)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Treatment of Advanced Diseases - NSCLC
    • Presentations: 1
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      MINI30.04 - A Randomized Phase 2 Trial of Cabozantinib, Erlotinib or the Combination as 2nd or 3rd Line Therapy in EGFR Wild-Type NSCLC: ECOG-ACRIN E1512 (ID 404)

      18:45 - 18:50  |  Author(s): M. Bowden

      • Abstract
      • Slides

      Background:
      Cabozantinib (C) is a small molecule inhibitor of multiple receptor tyrosine kinases, including MET, VEGFR2 & RET. MET is involved in tumor differentiation & VEGFR2 is a mediator of angiogenesis. Erlotinib (E) is FDA approved for the treatment of NSCLC.

      Methods:
      The primary objective of this randomized phase 2 study was to compare progression-free survival (PFS) of pts treated with E vs. C, & E vs E+C; each comparison had 91% power to detect a PFS hazard ratio (HR) of 0.5 with a 1-sided 0.10-level test stratified on prior number of therapies & ECOG PS. Secondary objectives included overall survival (OS), RECIST 1.1 response & CTCAE v4 toxicity. Pts were selected with previously treated (1-2 regimens) metastatic non-squamous EGFR wt NSCLC. Submission of archival tissue for central MET IHC testing was required. Oral daily dosing was: E-150 mg; C-60 mg; E+C-150 mg E, 40 mg C. Imaging was performed every 8 weeks. Pts optionally crossed over to E+C following progression on E or C.

      Results:
      125 pts were enrolled, of which 115 were eligible & treated (E, n=39; C, n=39; E+C, n=37). Pt characteristics were balanced between arms except for lower rate of brain mets history on E (p=0.02). Median follow up is 8.5 m. Compared with E (median 1.9 m), PFS was significantly improved on C (3.9 m, HR 0.33, p=0.0002, 80% CI 0.22-0.49) & E+C (4.1 m, HR 0.31, p=0.0002, 80% CI 0.21-0.46). Similarly, compared with E (median 4.0 m), OS was significantly improved on C (HR 0.52, p=0.02) & E+C arm HR 0.50, p=0.02). Grade 3-4 treatment-related hypertension & mucositis were higher on C and grade 3-4 diarrhea was higher on E+C. Overall worst grade toxicities were also significantly higher on C and E+C. MET IHC results were available on 88 patients from the primary analysis & 85% were positive (1-3+ membrane or cytoplasm staining with MET4 antibody). There was no correlation between MET status and PFS.

      Conclusion:
      C & C+E significantly improved PFS over E alone in pts with EGFR wt NSCLC. Cabozantinib-based regimens are promising for further investigation in this patient population. Funded by ECOG-ACRIN and NCI Contract No. HHSN261200800001E.

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